package cn.lee.chp1;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class HttpServer {
    //WEB_ROOT is our web HTML and resource reside
    public static final String WEB_ROOT = System.getProperty("user.dir")+File.separator +"webroot";
    
    //shutdown command
    public static final String SHUTDOWN_COMMAND = "SHUTDOWN";
    
    //the shutdown command received
    private boolean shutdown = false;
    
    public static void main(String[] args) {
        HttpServer server = new HttpServer();
        server.await();
    }
    
    public void await() {
        ServerSocket serverSocket = null;
        int port = 8080;
        try {
            serverSocket = new ServerSocket(port, 1, InetAddress.getByName("127.0.0.1"));
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }
        
        //loop waiting for a request
        while(!shutdown){
            Socket socket = null;
            InputStream in = null;
            OutputStream output = null;
            try {
                socket = serverSocket.accept();
                in = socket.getInputStream();
                output = socket.getOutputStream();
                //create request object and parse
                Request request = new Request(in);
                request.parse();
                //create Response object
                Response response = new Response(output);
                response.setRequest(request);
                response.sendStaticResource();
                
                //close the socket
                socket.close();
                
                //check if the previous URI is a shutdown command
                shutdown = SHUTDOWN_COMMAND.equals( request.getUri() );
            }catch (Exception e) {
                e.printStackTrace();
                continue;
            }
        }
    }
}
